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Apparently named after William, son of George IV, after a royal visit in 1821. This begs the question: What was it called before that? There must have been a native Irish name. Unfortunately Price provides no answer to this in PNCW. On the map of Wicklow contained in Wright's A Guide to the County of Wicklow (1827) this area is named Commons B.nulty, i.e. Commons of Ballynulty, which is a sub-division of the townland of Annacrivey. Since Prince William's Seat and Knocknagun they are only separated by a small saddle, it is possible that the name Knocknagun was applied to both peaks, but this is only conjecture.
Prince William's Seat is the 404th highest place in Ireland.Trackback: https://mountainviews.ie/summit/352/?PHPSESSID=ggqmfnesobsuk12oqoqb7v2kc0

A Christmas bouquet placed by someone at the foot of the trig pillar on Prince William's Seat: even without memorials, people are remembered in the mountains. I have noticed of late that a noticeable amount of work is being done on all sides of Glencree Valley. A stretch of the Wicklow Way, passing between Prince William's Seat and Raven's Rock is being "upgraded" with a somewhat raised surface of pounded earth and sand, cut by drainage channels at intervals. Further down, on the Curtlestown side, where the way had been all but obliterated by tree felling, this development is welcome, but it isn't altogether obvious why a reasonably valid path higher up needed "improvement". At Cloon, also on the north side of the valley, ample parking space is now provided on both sides of the road, and a wide forestry track takes strollers almost up to Glencree itself. On the south side, the car park at Crone has been greatly widened and a new path has been laid out from close to Ride Rock, overlooking Powerscourt Waterfall, right across the lower forested, north-facing slope of Maulin. The intention would seem to be to improve the recreational value of all these forest areas, which, being so close to Dublin, are popular at weekends and good starting points for more strenuous hillwalks. It's true that the erosion on the adjacent Djouce and Maulin is considerable, but perhaps not all the remedial work that is being undertaken by volunteers is the best. A few months ago, I met a group of people on the path leading up to Maulin from Glensoulan who were assiduously flattening every protruding stone they could find. In the end, the only thing the path will need will be a bit of tarmacadam. Trackback: https://mountainviews.ie/summit/352/comment/2930/